Imagine your standing atop a hill where there is only room for you. In every direction, the hill slopes downward into a valley which slopes up to another hill like your own.
Suddenly, the place where you are standing lowers towards the center of the earth and becomes a valley. What were valleys are now the hilltops.
Repeat that cycle of raising up and lowering down every few seconds and that’s a swell. If the distance between the hilltop and the valley is 30 feet. You’re in the land equivalent of 30 foot seas.
Trade the land for a deep body of water and things become quite sloppy. If you’re in a boat in 30 foot seas, better hope it’s a big boat.
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